These symptoms may last from several minutes to several hours. More
severe or longer-lasting symptoms may indicate more severe brain injury.
If a person loses consciousness, it will be for several minutes at the
most. If unconsciousness last for a longer period, a more serious form
of brain injury may have occurred.

Doctors use a three-point system to determine the seriousness of a
concussion. This system helps them to choose the appropriate treatment.

Grade 1:
No loss of consciousness, brief confusion, and other symptoms that
clear up within 15 minutes.

Grade 2:
No loss of consciousness, brief confusion, and other symptoms that
clear up in more than 15 minutes.

Grade 3:
Loss of consciousness for any period of time.

Days or weeks after the original concussion, certain symptoms may
reoccur. These symptoms are called post-concussion syndrome. They
include:

Headache

Loss of ability to concentrate and pay attention

Anxiety

Depression

Sleep disturbance

Inability to tolerate light and noise.

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